Analysis of event videos is generally considered more challenging than the related video-based action recognition task [1]}, [2]}, thanks to the richer contents of such event videos. Typical event videos are much longer (several minutes or even hours) than trimmed action recognition videos, and multiple human actions and a variety of different objects often appear across various scenes. For example, a “birthday party” event may take place at home or in a restaurant, with multiple objects coming into focus, e.g., a birthday cake, and may include a variety of activities that span multiple frames, e.g., singing the birthday song, or blowing out candles.
